string s = "Hello\r\nworld!";
int idx = s.IndexOf("\n");
Console.WriteLine(idx);

int idx = s.IndexOf("\n", StringComparison.Ordinal);

<ItemGroup>
   <RuntimeHostConfigurationOption Include="System.Globalization.UseNls" Value="true" />
</ItemGroup>

System.String.Compare
System.String.EndsWith
System.String.IndexOf
System.String.StartsWith
System.String.ToLower
System.String.ToLowerInvariant
System.String.ToUpper
System.String.ToUpperInvariant
System.Globalization.TextInfo (most members)
System.Globalization.CompareInfo (most members)
System.Array.Sort (when sorting arrays of strings)
System.Collections.Generic.List<T>.Sort() (when the list elements are strings)
System.Collections.Generic.SortedDictionary<TKey,TValue> (when the keys are strings)
System.Collections.Generic.SortedList<TKey,TValue> (when the keys are strings)
System.Collections.Generic.SortedSet<T> (when the set contains strings)

    [Flags]
public enum MiniDumpType
{
    MiniDumpNormal = 0x00000000,
    MiniDumpWithDataSegs = 0x00000001,
    MiniDumpWithFullMemory = 0x00000002,
    MiniDumpWithHandleData = 0x00000004,
    MiniDumpFilterMemory = 0x00000008,
    MiniDumpScanMemory = 0x00000010,
    MiniDumpWithUnloadedModules = 0x00000020,
    MiniDumpWithIndirectlyReferencedMemory = 0x00000040,
    MiniDumpFilterModulePaths = 0x00000080,
    MiniDumpWithProcessThreadData = 0x00000100,
    MiniDumpWithPrivateReadWriteMemory = 0x00000200,
    MiniDumpWithoutOptionalData = 0x00000400,
    MiniDumpWithFullMemoryInfo = 0x00000800,
    MiniDumpWithThreadInfo = 0x00001000,
    MiniDumpWithCodeSegs = 0x00002000,
    MiniDumpWithoutManagedState = 0x00004000
}

public static class NativeMethods
{
    [DllImport("Dbghelp.dll")]
    public static extern bool MiniDumpWriteDump(
        IntPtr hProcess,
        int processId,
        IntPtr hFile,
        MiniDumpType dumpType,
        IntPtr exceptionParam,
        IntPtr userStreamParam,
        IntPtr callbackParam);
}

public static class DebugInfo
{
    public static void CreateMiniDump(
        string dumpFileName, MiniDumpType dumpType = MiniDumpType.MiniDumpNormal)
    {
        using (var stream = File.Create(dumpFileName))
        {
            var process = Process.GetCurrentProcess();
            // It is safe to call DangerousGetHandle() here because the process is already crashing.
            NativeMethods.MiniDumpWriteDump(
                            process.Handle,
                            process.Id,
                            stream.SafeFileHandle.DangerousGetHandle(),
                            dumpType,
                            IntPtr.Zero,
                            IntPtr.Zero,
                            IntPtr.Zero);
        }
    }
 
    public static void CreateMiniDump(MiniDumpType dumpType = MiniDumpType.MiniDumpNormal)
    {
        const string dateFormat = "yyyy-MM-dd-HH-mm-ss-fffZ"; // Example: 2010-09-02-09-50-43-341Z
        var thisAssembly = Assembly.GetEntryAssembly() ?? Assembly.GetCallingAssembly();
        var dumpFileName = string.Format(@"{0}-MiniDump-{1}.dmp",
                    thisAssembly.GetName().Name,
                    DateTime.UtcNow.ToString(dateFormat, CultureInfo.InvariantCulture));
 
        var path = Path.Combine(getApplicationPath(), dumpFileName);
        CreateMiniDump(path, dumpType);
    }
 
    private static string getApplicationPath()
    {
        return HttpContext.Current != null ?
            HttpRuntime.AppDomainAppPath :
            Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
    }
}

class Program
{
    static void Main(string[] args)
    {
        try
        {
            var zero = 0;
            Console.WriteLine(1 / zero);
        }
        catch (Exception ex)
        {
            Console.Write(ex);
            DebugInfo.CreateMiniDump(dumpType:
                                MiniDumpType.MiniDumpNormal |
                                MiniDumpType.MiniDumpWithPrivateReadWriteMemory |
                                MiniDumpType.MiniDumpWithDataSegs |
                                MiniDumpType.MiniDumpWithHandleData |
                                MiniDumpType.MiniDumpWithFullMemoryInfo |
                                MiniDumpType.MiniDumpWithThreadInfo |
                                MiniDumpType.MiniDumpWithUnloadedModules);
 
            throw;
        }
    }
}